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# Firebase Tokens

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A library to work with [Google Firebase](https://firebase.google.com) tokens. You can use it to 
[create custom tokens](https://firebase.google.com/docs/auth/admin/create-custom-tokens) and 
[verify ID Tokens](https://firebase.google.com/docs/auth/admin/verify-id-tokens).

Achieve more with the [Firebase Admin SDK](https://github.com/kreait/firebase-php) for PHP (which uses this library). 

## Installation

```
composer require kreait/firebase-tokens
```

## Create a custom token

```php
use Firebase\Auth\Token\Generator;

$generator = new Generator($clientEmail, $privateKey);

$uid = 'a-uid';
$claims = ['foo' => 'bar'];

$token = $generator->createCustomToken($uid, $claims); // Returns a Lcobucci\JWT\Token instance

echo $token;
```

## Verify an ID token

```php
use Firebase\Auth\Token\Verifier;

$verifier = new Verifier($projectId);

try {
    $verifiedIdToken = $verifier->verifyIdToken($idToken);
    
    echo $verifiedIdToken->getClaim('sub'); // "a-uid"
} catch (\Firebase\Auth\Token\Exception\ExpiredToken $e) {
    echo $e->getMessage();
} catch (\Firebase\Auth\Token\Exception\IssuedInTheFuture $e) {
    echo $e->getMessage();
} catch (\Firebase\Auth\Token\Exception\InvalidToken $e) {
    echo $e->getMessage();
}
```

### Cache results from the Google Secure Token Store

In order to verify ID tokens, the verifier makes a call to fetch Firebase's currently available public
keys. The keys are cached in memory by default.

If you want to cache the public keys more effectively, you can use any [implementation of 
psr/simple-cache](https://packagist.org/providers/psr/simple-cache-implementation).

Example using the [Symfony Cache Component](https://symfony.com/doc/current/components/cache.html)

```php
use Firebase\Auth\Token\HttpKeyStore;
use Firebase\Auth\Token\Verifier;
use Symfony\Component\Cache\Simple\FilesystemCache;

$cache = new FilesystemCache();
$keyStore = new HttpKeyStore(null, $cache);

$verifier = new Verifier($projectId, $keyStore); 
```

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